sensor ACURA CSX 2006 Service Repair Manual

DTCDetection Item ABS
Indicator Brake
System
Indicator VSA
Indicator VSA
Activation Indicator Note
19-103
61 -01 VSA Modulator-control Unit Initial IG Low Voltage ON ON ON ON (see page 19-143)
-21 VSA Modulator-control Unit Power Source LowVoltage 1 ON ON ON ON (see page 19-143)
-22 VSA Modulator-control Unit Power Source Low Voltage 2 ON OFF ON ON (see page 19-143)
-23 VSA Modulator-control Unit Power Source Low Voltage 3 ON ON ON ON (see page 19-143)
62 -21 VSA Modulator-control Unit IG High Voltage ON ON ON ON (see page 19-144)
64 -11 Steering Angle Sensor Power Circuit Short OFF OFF ON ON (see page 19-144) -12 Steering Angle Sensor Power Circuit Open OFF OFF ON ON (see page 19-145)
65 -21 Brake Fluid Level Stuck ON OFF OFF ON ON (see page 19-147)
66 -11 Pressure Sensor (Inside of VSA Modulator-control Unit) Malfunction OFF OFF ON ON (see page 19-148)
-12 Pressure Sensor (Inside of VSA Modulator-control Unit) Malfunction OFF OFF ON ON (see page 19-148)
-13 Pressure Sensor (Inside of VSA Modulator-control Unit) Malfunction OFF OFF ON ON (see page 19-148)
-14 Pressure Sensor (Inside of VSA Modulator-control Unit) Malfunction OFF OFF ON ON (see page 19-148)
-15 Pressure Sensor (Inside of VSA Modulator-control Unit) Malfunction OFF OFF ON ON (see page 19-149)
-16 Pressure Sensor (Inside of VSA Modulator-control Unit) Malfunction OFF OFF ON ON (see page 19-148)
68 -21 Brake Pedal Position Switch Stuck OFF OFF OFF ON ON (see page 19-149) -22 Brake Pedal Position Switch Stuck ON OFF OFF ON ON (see page 19-151)
71 -21 Right-front or Left-rear Different Diameter Tire Malfunction ON ON ON ON (see page 19-152)
-22 Left-front or Right-rear Different Diameter Tire Malfunction ON ON ON ON (see page 19-152)
-23 Right-front and Right-rear Different Diameter Tire Malfunction ON ON ON ON (see page 19-152)
-24 Left-front and Left-rear Different Diameter Tire Malfunction ON ON ON ON (see page 19-152)
-25 Right-front and Left-front Different Diameter Tire Malfunction ON ON ON ON (see page 19-152)
-26 Right-rear and Left-rear Different Diameter Tire Malfunction ON ON ON ON (see page 19-152)
-27 Right-front or Left-rear Different Diameter Tire Malfunction OFF OFF ON ON (see page 19-152)
-28 Left-front or Right-rear Different Diameter Tire Malfunction OFF OFF ON ON (see page 19-152)
-29 Right-front and Right-rear Different Diameter Tire Malfunction OFF OFF ON ON (see page 19-152)
-2A Left-front and Left-rear Different Diameter Tire Malfunction OFF OFF ON ON (see page 19-152)
-2B Right-front and Left-front Different Diameter Tire Malfunction OFF OFF ON ON (see page 19-152)
-2C Right-rear and Left-rear Different Diameter Tire Malfunction OFF OFF ON ON (see page 19-152)
81 -01 ON ON ON ON (see page 19-153) -02 ON ON ON ON (see page 19-153)
-03 ON ON ON ON (see page 19-153)
-05 ON ON ON ON (see page 19-153)
-06 ON ON ON ON (see page 19-153)
-07 ON ON ON ON (see page 19-153)
-08 ON ON ON ON (see page 19-153)
-11 ON ON ON ON (see page 19-153)
-12 ON ON ON ON (see page 19-153)
-13 ON ON ON ON (see page 19-153)
-14 ON ON ON ON (see page 19-153)
-21 ON ON ON ON (see page 19-153)
-22 ON ON ON ON (see page 19-153)
-23 ON ON ON ON (see page 19-153)
(cont’d)
Central Processing Unit (CPU) Internal Circuit Malfunction
Central Processing Unit (CPU) Internal Circuit Malfunction
Central Processing Unit (CPU) Internal Circuit Malfunction
Central Processing Unit (CPU) Internal Circuit Malfunction
Central Processing Unit (CPU) Internal Circuit Malfunction
Central Processing Unit (CPU) Internal Circuit Malfunction
Central Processing Unit (CPU) Internal Circuit Malfunction
Central Processing Unit (CPU) Internal Circuit Malfunction
Central Processing Unit (CPU) Internal Circuit Malfunction
Central Processing Unit (CPU) Internal Circuit Malfunction
Central Processing Unit (CPU) Internal Circuit Malfunction
Central Processing Unit (CPU) Internal Circuit Malfunction
Central Processing Unit (CPU) Internal Circuit Malfunction
Central Processing Unit (CPU) Internal Circuit Malfunction
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DTCDetection Item ABS
Indicator Brake
System
Indicator VSA
Indicator VSA
Activation Indicator Note
19-104VSA System Components
DTC Troubleshooting Index (cont’d)
81 -31
ON ON ON ON (see page 19-153)
-32 ON ON ON ON (see page 19-153)
-33 ON ON ON ON (see page 19-153)
-35 ON ON ON ON (see page 19-153)
-36 ON ON ON ON (see page 19-153)
-37 ON ON ON ON (see page 19-153)
-38 ON ON ON ON (see page 19-153)
-39 ON ON ON ON (see page 19-153)
-3A ON ON ON ON (see page 19-153)
-3C ON ON ON ON (see page 19-153)
-3D ON ON ON ON (see page 19-155)
-3E ON ON ON ON (see page 19-155)
-40 ON ON ON ON (see page 19-153)
-41 ON ON ON ON (see page 19-153)
-42 ON ON ON ON (see page 19-153)
-51 ON ON ON ON (see page 19-154)
-52 ON ON ON ON (see page 19-153)
-53 ON ON ON ON (see page 19-154)
-54 ON ON ON ON (see page 19-153)
-55 ON ON ON ON (see page 19-154)
-56 ON ON ON ON (see page 19-153)
-57 ON ON ON ON (see page 19-154)
-58 ON ON ON ON (see page 19-153)
-59 ON ON ON ON (see page 19-155)
-61 ON ON ON ON (see page 19-153)
-71 ON OFF ON ON (see page 19-153)
-80 ON ON ON ON (see page 19-153)
83 -13 ECM/PCM Communication Error OFF OFF ON ON (see page 19-155)
-14 ECM/PCM Communication Error OFF OFF ON ON (see page 19-155)
84 -21 VSA Sensor Neutral Position Not Writing OFF OFF ON ON (see page 19-156)
86 -01 F-CAN Bus-off Malfunction OFF OFF ON ON (see page 19-156)
-11 F-CAN Communication with ECM/PCM Malfunction OFF OFF ON ON (see page 19-157)
-21 F-CAN Communication with Engine Malfunction OFF OFF ON ON (see page 19-157)
-22 F-CAN Communication with Engine Malfunction OFF OFF ON ON (see page 19-157)
-23 F-CAN Communication with Engine Malfunction OFF OFF ON ON (see page 19-157)
-24 F-CAN Communication with Engine Malfunction OFF OFF ON ON (see page 19-157)
-25 F-CAN Communication with Engine Malfunction OFF OFF ON ON (see page 19-157)
-31 F-CAN Communication with Gauge Control Module Malfunction OFF OFF ON ON (see page 19-159)
F-CAN Communication with EAT Malfunction OFF OFF ON ON (see page 19-157)
-71 F-CAN Communication with Yaw Rate-Lateral Acceleration Sensor Malfunction OFF OFF ON ON (see page 19-160)
107 -22 Central Processing Unit (CPU) Internal Circuit Malfunction OFF OFF OFF ON (see page 19-162)
108 -21 Steering Angle Sensor Malfunction OFF OFF OFF ON (see page 19-162)
112 -01 Central Processing Unit (CPU) Internal Circuit Malfunction ON ON ON ON (see page 19-163)
121 -01 VSA Solenoid Valve Malfunction ON ON ON ON (see page 19-164)
-02 VSA Solenoid Valve Malfunction ON ON ON ON (see page 19-164)
-11 VSA Solenoid Valve Malfunction ON ON ON ON (see page 19-164)
-21 VSA Solenoid Valve Malfunction ON ON ON ON (see page 19-164)
-24 VSA Solenoid Valve Malfunction ON ON ON ON (see page 19-164)
122 -01 VSA Solenoid Valve Malfunction ON ON ON ON (see page 19-164)
-21 VSA Solenoid Valve Malfunction ON ON ON ON (see page 19-164)
-22 VSA Solenoid Valve Malfunction ON ON ON ON (see page 19-164)
-23 VSA Solenoid Valve Malfunction ON ON ON ON (see page 19-164)
123 -01 VSA Solenoid Valve Malfunction ON ON ON ON (see page 19-164)
-02 VSA Solenoid Valve Malfunction ON ON ON ON (see page 19-164)
-11 VSA Solenoid Valve Malfunction ON ON ON ON (see page 19-164)
-21 VSA Solenoid Valve Malfunction ON ON ON ON (see page 19-164)
-24 VSA Solenoid Valve Malfunction ON ON ON ON (see page 19-164)
124 -01 VSA Solenoid Valve Malfunction ON ON ON ON (see page 19-164)
-21 VSA Solenoid Valve Malfunction ON ON ON ON (see page 19-164)
-22 VSA Solenoid Valve Malfunction ON ON ON ON (see page 19-164)
-23 VSA Solenoid Valve Malfunction ON ON ON ON (see page 19-164)
4: A/TCentral Processing Unit (CPU) Internal Circuit Malfunction
Central Processing Unit (CPU) Internal Circuit Malfunction
Central Processing Unit (CPU) Internal Circuit Malfunction
Central Processing Unit (CPU) Internal Circuit Malfunction
Central Processing Unit (CPU) Internal Circuit Malfunction
Central Processing Unit (CPU) Internal Circuit Malfunction
Central Processing Unit (CPU) Internal Circuit Malfunction
Central Processing Unit (CPU) Internal Circuit Malfunction
Central Processing Unit (CPU) Internal Circuit Malfunction
Central Processing Unit (CPU) Internal Circuit Malfunction
Central Processing Unit (CPU) Internal Circuit Malfunction
Central Processing Unit (CPU) Internal Circuit Malfunction
Central Processing Unit (CPU) Internal Circuit Malfunction
Central Processing Unit (CPU) Internal Circuit Malfunction
Central Processing Unit (CPU) Internal Circuit Malfunction
Central Processing Unit (CPU) Internal Circuit Malfunction
Central Processing Unit (CPU) Internal Circuit Malfunction
Central Processing Unit (CPU) Internal Circuit Malfunction
Central Processing Unit (CPU) Internal Circuit Malfunction
Central Processing Unit (CPU) Internal Circuit Malfunction
Central Processing Unit (CPU) Internal Circuit Malfunction
Central Processing Unit (CPU) Internal Circuit Malfunction
Central Processing Unit (CPU) Internal Circuit Malfunction
Central Processing Unit (CPU) Internal Circuit Malfunction
Central Processing Unit (CPU) Internal Circuit Malfunction
Central Processing Unit (CPU) Internal Circuit Malfunction
Central Processing Unit (CPU) Internal Circuit Malfunction
-414
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VSA Modulator-Control Unit Inputs and Outputs for 37P Connector (Connector Disconnected)
TerminalnumberWire color Terminal sign Description Signal
19-106VSA System Components
System Description
NOTE: Standard battery voltage is about 12 V.
1 RED CAN-L F-CAN communication circuit
3 BLU STR-D Detects steering angle sensor signal
6 PNK FR-GND Detects right-front wheel speed sensor signal
7 ORN SVCC Power source for the steering angle sensor With ignition switch ON (II): about 5.0 V
8 PUR RL-GND Detects left-rear wheel speed sensor signal
9 LT GRN RR B Detects right-rear wheel speed sensor signal
10 BRN SGND Ground for the steering angle sensor
11 RED FL-GND Detects left-front wheel speed sensor signal
13 WHT FSR B Power source for the fail-safe relay Battery voltage at all times
14 RED MR B Power source for the motor relay Battery voltage at all times
Wire side of female terminals
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TerminalnumberWire color Terminal sign Description Signal
19-107
NOTE: Standard battery voltage is about 12 V.
15 WHT CAN-H F-CAN communication circuit
17 PUR STR-B Detects steering angle sensor signal
19 GRN FR B Detects right-front wheel speed sensor signal
20 YEL RL B Detects left-rear wheel speed sensor signal
21 BLU RR-GND Detects right-rear wheel speed sensor signal
22 WHT FL B Detects left-front wheel speed sensor signal
26 LT BLU K-LINE Communication with HDS
28 GRY IG1 Power source for activating the system With ignition switch ON (II): about battery
voltage
34 GRN STR-A Detects steering angle sensor signal
36 BLK GND Ground for the VSA modulator- control unit Continuity to ground
37 BLK MR-GND Ground for the pump motor Continuity to ground
(cont’d)
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System Outline
19-108VSA System Components
System Description (cont’d)
CONTROL UNIT
MODULATOR UNIT VSA MODULATOR-
CONTROL UNIT
Brake pressure
signal
 Solenoid control
 Motor control
Communication via F-CAN
VSA
OFF
SWITCH
PARKING
BRAKE
SWITCH BRAKE
FLUID
LEVEL
SWITCH
WHEEL SPEED SENSOR
 Engine torque control request
 Control mode signal
 VSA control enable/disable
 Throttle open angle signal
 Engine revolution signal
 Brake pedal
position switch signal
 Service check signal
 Gear position signal
Wheel rotation
pulse signal
ECM/PCM
BRAKE
PEDAL
POSITION
SWITCH
GAUGE CONTROL MODULE (TACH)
YAW RATE-LATERAL
ACCELERATION
SENSORSTEERING ANGLE
SENSOR
VSAOFFswitchsignal
 Parking brake switch signal
 Brake fluid level switch signal
 Yaw rate signal
 Lateral acceleration signal Steering angle signal
 Indicator drive signal
 Buzzer request signal*
*: ’09 model
This system is composed of the VSA modulator-control unit, the wheel speed sensors, the steering angle sensor, the
yaw rate-lateral acceleration sensor, and the system indicators in the gauge control module (tach). The VSA
modulator-control unit controls the ABS, EBD, TCS, VSA, and brake assist with the brake pressure of each wheel and
reduces engine torque.
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ABS Features
Anti-lock control
Grip force of tire and road surface
Main Control
19-109
COEFFICIENT OF
FRICTIONTARGET SLIP RATE
ROTATIONAL
DIRECTION
RADIAL
DIRECTION
OF THE
ROTATIONAL
DIRECTION
SLIP RATE
LEFT-REAR
WHEEL SPEED
SENSOR RIGHT-REAR
WHEEL SPEED
SENSOR
LEFT-FRONT
WHEEL SPEED
SENSOR RIGHT-FRONT
WHEEL SPEED
SENSOR Select Low
Speed Wheel
Detect
Vehicle Speed
Drive
SolenoidRIGHT-REAR
SOLENOID
LEFT-REAR
SOLENOID
RIGHT-FRONT
SOLENOID
LEFT-FRONT
SOLENOID
CONTROL UNIT
ABS
Control
Reference
Slip Rate
Drive
Solenoid
ABS
Control
Drive
Solenoid
ABS
Control
Drive
Solenoid
ABS
Control
RIGHT-FRONT
LEFT-FRONT
Detect
Wheel Speed
Detect
Slip Rate
RIGHT-REAR
LEFT-REAR Detect
Slip Rate
Detect
Slip Rate
Detect
Slip Rate
Detect
Wheel Speed
Detect
Wheel Speed
Detect
Wheel Speed
Without ABS, when the brake pedal is pressed while driving, the wheels sometimes lock before the vehicle comes to a
stop. In such an event, the maneuverability of the vehicle is reduced if the front wheels are locked, and the stability of
the vehicle is reduced if the rear wheels are locked, creating an extremely unstable condition. With ABS, the system
precisely controls the slip rate of the wheels to ensure maximum grip force from the tires, and it thereby ensures
maneuverability and stability of the vehicle. The ABS calculates the slip rate of the wheels based on the four wheel
speeds, and then it controls the brake fluid pressure to reach the target slip rate.
The control unit detects the wheel speed based on the wheel speed sensor signals it receives, then it calculates the
vehicle speed based on the detected wheel speed. The control unit detects the vehicle speed during deceleration
based on the wheel speeds.
The control unit calculates the slip rate of each wheel, and transmits the control signal to the modulator unit solenoid
valve when the slip rate is high.
The hydraulic control has three modes: Pressure intensifying, pressure reducing, and pressure retaining.
(cont’d)
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EBD Features
TCS Features
19-110VSA System Components
System Description (cont’d)
REAR WHEEL
BRAKE PRESSURE
With EBD under HEAVY LOAD
at REAR WHEELS
With EBD under LIGHT LOAD
at REAR WHEELS
Without EBD
FRONT WHEEL BRAKE PRESSURE
ANTI-POWER of BRAKE FORCE
TOTAL TRACTION DRIVING POWER
TOTAL TRACTION
BRAKE FORCE
SLIPPERY ROAD SURFACE
NORMAL ROAD SURFACE
The electronic brake distribution (EBD) feature helps control vehicle braking by adjusting the rear brake force in
accordance with the rear wheel load before the ABS operates. Based on the wheel speed sensor signals, the control
unit uses the modulator to control the rear brakes individually. When the rear wheel speed is less than the front wheel
speed, the VSA modulator-control unit retains the current rear brake fluid pressure by closing the inlet valve in the
modulator. As the rear wheel speed increases, and approaches the front wheel speed, the VSA modulator-control unit
increases the rear brake fluid pressure by momentarily opening the inlet valve. This whole process is repeated very
rapidly. While this is happening, kickback may be felt at the brake pedal.
When a drive wheel loses traction on a slippery road surface and starts to spin, the VSA modulator-control unit applies
brake pressure to the spinning wheel, and sends an engine torque control request to the ECM/PCM to slow the
spinning wheel and keep traction.
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Modulator Unit
Mode VSA NOValveVSA NC
Valve Inlet
Solenoid Valve Outlet
Solenoid Valve Brake Fluid
Pressure
intensifying
mode
Pressure
retaining
mode
Pressure
reducing
mode
Pressure
adding
mode
19-113
FL RR RL
FR
OUT OUT
IN
IN
VSA NO VSA NC
REGULATOR
VALVE PRESSURE
SENSOR
DAMPING
CHAMBER
RESERVOIR MOTOR
RESERVOIRVSA NC VSA NO
REGULATOR
VALVE IN
IN OUT
OUT
MODULATOR UNIT
IN : INLET SOLENOID VALVE (NORMALLY OPEN)
OUT : OUTLET SOLENOID VALVE (NORMALLY CLOSED)
MASTER CYLINDER
The modulator unit consists of the inlet solenoid valve, the outlet solenoid valve, the VSA NO (normally open)
solenoid valve, the VSA NC (normally closed) solenoid valve, the reservoir, the pump, the pump motor, and the
damping chamber.
The hydraulic control has three modes at ABS action; pressure intensifying, pressure retaining, and pressure reducing.
Pressure adding mode is combined the TCS, VSA, and brake assist action.
The hydraulic circuit is an independent four channel type; one channel for each wheel.




open closed open closed Master cylinder fluid is pumped out to
the caliper.
open closed closed closed Caliper fluid is retained by the inlet and outlet valves.
open closed closed open Caliper fluid flows through the outlet valve to the reservoir.
The motor pumps the reservoir fluid
through the damping chamber to
the master cylinder .
closed open open closed Master cylinder fluid is pumped out by pump with motor through VSA
NC valve to the caliper.
Caliper fluid pressure exceeds
master cylinder pressure.
: The motor will keep running until the operation of the one anti-lock brake control is finished with the first pressure reducing mode.
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19-114VSA System Components
Circuit Diagram
UNDER-DASH
FUSE/RELAY BOX
No. 4 (7.5 A)
IGNITION SWITCH
IG1 HOT in ON (II) and START (III)
BRAKE PEDAL
POSITION SWITCH
Closed: Brake pedal pressed 1
2
WHTRED
YAW RATE-
LATERAL
ACCELERATION
SENSOR
WHT RED 1
3
4
YEL
5
BLK
4
2
1 VSA OFF SWITCH
WHT
WHT
RED
5
No. 3 (40 A)
No.1(100A) No.2(50A)
No. 3 (30 A)
No. 12 (15 A)
UNDER-HOOD FUSE/RELAY BOX
BATTERY
ABS
INDICATOR
BRAKE SYSTEM
INDICATOR
1
VSA ACTIVATION
INDICATOR VSA
INDICATOR
19
28
27
GAUGE CONTROL
MODULE (TACH)
BRNB
WHT
29
RED
GRN
14
RED
G501
C2 C1
E24
F16
YEL
G602
BLU
LT GRN GRYREDBRN
BLK
WHT
LT GRN GRY
H1
D8 36 D2
G502
BLK
WHT
RED
WHT
LT BLU
B
G401
BRAKE FLUID
LEVEL SWITCH
Closed: Low fluid
1 2
BLK
ORN ORN
1
PARKING
BRAKE SWITCH
Closed: Parking
brake applied DATA LINK
CONNECTOR (DLC)
ORN
IG1
6
16
4 714
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19-115
VSA MODULATOR-CONTROL UNIT
CONTROL UNIT
5V
REGULATOR MODULATOR UNIT
VSA1
VSA2
LEFT-FRONT
RIGHT-FRONT LEFT-REAR
RIGHT-REAR
PUMP MOTOR
G202 PRESSURE
SENSOR
SOLENOIDS
IC 13
14
22
11 19 6
20 8
9
21
37
36 34
17 3
7
10
15 1
26
1 2 1
2
2
1
1 2 28
WHT RED
GRN
PUR
BLU
ORN
BRN
WHT RED
LT BLU
GRN
PNK
BLK BLK
LT GRN
WHTRED A40
A36
A37
WHT RED 2
4
3
5
1
STEERING
ANGLE
SENSOR
PUR
LT GRN
RED
LT BLU
GRY PUMP MOTOR RELAY
FAIL-SAFE RELAY
VCC
VCC
IG1
CAN
CONTROLLER
:12V :5V VCC
ELECTRIC
CURRENT
LIMITATION
B
GND IG1
VCC
GRY
BLU YEL
RED
WHT
ECM/PCM
WHEEL SPEED SENSOR
NC NO
NCNO
IN
OUT
IN OUT
IN OUT
INOUT
FSR B MR B
FL B
FL-GND FR B
FR-GND
RL B
RL-GND RR B
RR-GND
MR-GND
GND
STR-A
STR-B
STR-D
SVCC
SGND
CAN-H
CAN-L
K-LINE IG1
(cont’d)
08/08/21 15:04:56 61SNR030_190_0115
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